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Dimaprit--induced neurotoxicity.

R L Swaab1, A M Battles, C A Bruner

  • 1Department of Pharmacology and Toxicology, Albany Medical College, NY 12208.

Agents and Actions
|March 1, 1992
PubMed
Summary
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The histamine H2 agonist dimaprit causes lethal brain necrosis, even at low doses. Its neurotoxicity appears unrelated to brain H2 receptors, requiring cautious use in research.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Toxicology

Background:

  • Histamine H2 agonists are used to study H2 receptor responses.
  • Dimaprit is a known H2 agonist with potential applications in neurological research.

Purpose of the Study:

  • To characterize the neurotoxicity of the histamine H2 agonist dimaprit.
  • To determine if dimaprit's neurotoxicity is mediated by brain H2 receptors.

Main Methods:

  • Administration of dimaprit into the lateral cerebral ventricle in animal models.
  • Dose-response studies evaluating survival, brain pathology, and body weight.
  • Comparative analysis with other H2 agonists and antagonists.

Main Results:

  • A dose of 100 micrograms of dimaprit induced uniformly lethal brain necrosis within 1-3 days.

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  • Lower doses exhibited dose-related effects on survival, gross brain pathology, and body weight.
  • Neurotoxicity was observed to be independent of brain H2 receptors, similar to its congener homodimaprit.

    • Conclusions:

    • Dimaprit exhibits significant neurotoxicity, causing lethal brain necrosis.
    • The neurotoxic effects of dimaprit are independent of H2 receptor interactions.
    • Researchers should exercise caution when using dimaprit to study H2 receptor-mediated events in the brain.